Castillo was the lone student killed in Tuesday’s shooting at the STEM School Highlands Ranch. Eight others were shot and injured, and one of the victims remained hospitalized in fair condition Friday.

Castillo is one of the heroic students credited with rushing one of the shooters on Tuesday, perhaps preventing more injuries and possible deaths. Fellow students who joined him in doing so called Castillo a hero.

Friday would have been his last day of his senior year of high school. At STEM, Castillo was a member of the robotics team and was well-known to others as a promising young electrician who had plans to study electrical engineering.

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